Product Specification Package : 5 Pcs, 2x 6 mm -LRB- 1/4 '' -RRB-, 1x 8 mm -LRB- 5/16 '' -RRB-, 1x 10 mm -LRB- 3/8 '' -RRB-, 1x 12 mm -LRB- 1/2 '' -RRB- Material : sopranino quality tungsten carbide tip Shank : 3-flats shank Color : pitch blackness & Silver Package : see-through pliant box Used for : tile, concrete, brick, glass, pliant and wood, etc Feature sopranino quality, serviceable, pricise drilling in individual materials at synoptic time, convinient for use with longest life time User Instruction Tool : Power drill. Do not impact mode of drill or hammers When drilling hardened material -LRB- glass, porcelain floor tile, marble or granite -RRB-, please use water for lubrication .